C# get windows user app data folder path

 Hi folks,

Today I will explain to get the folder path of the windows user specific app data for storing any program (app) based information in C# (.NET Framework, .NET CORE, .NET 5)

Source

using System;

using System.IO;

namespace NETFrameworkConsoleApp1

{

    class Program

    {

        static void Main(string[] args)

        {

            string dir = Path.Combine(

                Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),

                "FolderName"

            );

            Console.WriteLine("User Appdata Path: \n " + dir);

            Console.ReadLine();

        }

    }

}

Hope this helps you to customize your requirement.

References

https://docs.microsoft.com/en-us/dotnet/api/system.environment?view=net-5.0

Please share your comments and feedback to psrdotcom@gmail.com

C++ get windows user app data folder path

 Hi folks,

Today we will see how we can get the folder path of the windows user specific app data for storing any program (app) based information.

Source

#include <iostream>

#include <tchar.h>

#include <shlwapi.h>

#pragma comment(lib,"shlwapi.lib")

#include "shlobj.h"

using namespace std;

int main()

{  

    TCHAR szPath[MAX_PATH];

    // Get path for each computer, non-user specific and non-roaming data.

    if (SUCCEEDED(SHGetFolderPath(NULL, CSIDL_APPDATA, NULL, 0, szPath)))

    {

        // Append product-specific path

        PathAppend(szPath, _T("\\App Folder Path\\"));

        wcout << "User AppData Roaming Folder Path: \n" << szPath << endl << endl;

    }

    

    // Get path for each computer, non-user specific and non-roaming data.

    if (SUCCEEDED(SHGetFolderPath(NULL, CSIDL_PROGRAM_FILES, NULL, 0, szPath)))

    {

        wcout << "System Program Files Folder Path: \n" << szPath << endl << endl;

    }

    cout << "==end==";

}

Hope this helps you to customize your requirement.

References

https://docs.microsoft.com/en-us/windows/win32/shell/csidl

Please share your comments and feedback to psrdotcom@gmail.com

Android NDK JNI Windows xp/7 with 32/64 bit Installation Problems with Solutions in Eclipse without C/C++ CDT Plugin

Hi all,

I spent 2 days on configuring this. I read lot of blogs and instrutction steps from various sites. I would like share my experience on installing Android NDK and Working with Eclipse.

Objective:
Using JNI Technology in Eclipse with Android NDK r6/r7 on Windows xp/7 Professional

Pre-requirements:

1. Java SE SDK -- Java Development Kit
2. Eclipse Helios/Indigo -- IDE to work with Java, Android, C/C++ etc.
3. Android SDK -- Android Applications Development Kit
4. Android ADT Plugin for Eclipse -- Download the latest Android SDK Platform Tools
5. C/C++ Plugin for Eclipse (Optional) -- Make sure that .c, .cpp, .h files opening from Eclipse
6. Android NDK (r6/r7) -- Native development i.e. Running c libraries in Android
7. Cygwin 1.7.x or above -- Makefile creation, Library file creation tools, Compiling C files

Installation:

1. Install the Java Development Kit
   
2. Install the Android SDK and ADT Plugin with Eclipse
3. [Optional] Install CDT plugin for Eclipse
4. Download and extract the Android NDK
5. Install Cygwin 1.7.x or above

Note: Don't extract in a folder where folder name is having spaces in between words.
Example:
"Program Files" -- Don't Use
"ProgramFiles" -- Use

Configuration:
Please make sure that you have set the environment variables like

• JAVA_HOME -- Java Home Directory
• NDK_HOME -- Android NDK Home Directory
• Update Path Variable with JDK Bin folder

Creating Android Application

• In Eclipse, Select File->New->Android Project

• Enter the Project Name and Click on "Next" button

• Select the "Build Target", I opted for Android 2.2, SDK 8 Version and Click on "Next" button

• In Application Info dialog, enter the "Package Name" and Select "Finish" button

• Now, you can see the newly created SampleNDK project in the eclipse project explorer window

Example:

• Eclipse Workspace Folder: D:\Workspace
• Android Application Name: SampleNDK
• Android Application Working Folder: D:\Workspace\SampleNDK
• Package Name: com.samplendk
• Android Application Source Folder: D:\Workspace\SampleNDK\src

Source of AndroidNDKActivity.java

package com.samplendk;

import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;

public class SampleNDKActivity extends Activity {
   
    //Declare the native method
    private native String invokeNativeFunction();
   
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        //Call the native methods
        String hello = invokeNativeFunction();
        new AlertDialog.Builder(this).setMessage(hello).show();
    }
   
}

• Create a folder named "jni" in the project

• Right click on the "SampleNDK" project-> Select "New"-> Select "Folder"->Type "jni"

• Create files "Android.mk" and "native.c" in Jni folder

• Right click on the "jni" folder-> Select "New"-> Select "File"->Type "Android.mk"
• Right click on the "jni" folder-> Select "New"-> Select "File"->Type "native.c"

• After Creating those folder and files, the project explorer window look like this

• Do some continuous steps.

• Build, Refresh, and Clean project

• Right Click on the "SampleNDK" project and Select the "Build Project"

• Select "Sample NDK" project and Click "F5" button on keyboard

• Select "Project" menu and Select "Clean" option

• Create header file of the java file

• In windows command prompt, change to project source directory

• Syntax:

• cmd>

• cmd> cd ProjectDir/src

• Example:

• cmd> D:

• D:\> cd SampleNDK/src

• Run the Javah command to create header file

• Syntax:

• cmd> javah -jni .javafile_without_.java_extension // JDK 1.7

• cmd> javah -classpath ..\bin\classes .javafile_without_.java_extension //JDK1.6

• Example:

• D:\SampleNDK\src> javah -jni com.samplendk.SampleNDKActivity //JDK1.7

• D:\SampleNDK\src> javah -classpath ..\bin\classes com.samplendk.SampleNDKActivity //JDK1.6

• Note:

• Don't include the .java at the end of javah command

• Copy the created java header file to jni folder

• D:\SampleNDK\src> copy com_samplendk_SampleNDKActivity.h ..\jni

• Go to Eclipse and Refresh the project by pressing "F5" on keyboard.

• Open the header file from jni folder

• Copy the function created by javah as shown below

• Paste the code in native.c and change the code similar to this

Source of native.c

#include <string.h>
#include "com_samplendk_SampleNDKActivity.h"

jstring JNICALL Java_com_samplendk_SampleNDKActivity_invokeNativeFunction
  (JNIEnv *env, jobject obj)
{
    return (*env)->NewStringUTF(env, "Hello from native function !!");
}

Source of Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
# Here we give our module name and source file(s)
LOCAL_MODULE := SampleNDK
LOCAL_SRC_FILES := native.c

include $(BUILD_SHARED_LIBRARY)

• Run Cygwin.bat file in the Cygwin installed directory

• It will open the cygwin command prompt

• Change the directory to SampleNDK project directory

• Note: All the drives in your systems are mounted to some directory in the cygwin.

• To see your drive mount points type mount

• # mount

• # cd /cygdrive/d/SampleNDK/

• Run the ndk-build command from the android ndk directory

• # /cygdrive/d/android-ndk-r7/ndk-build

• Error(Only in Android-ndk-r7):

• You may get some error like the following

• /awk.exe: can't open file check-awk.awk

• Andoid NDK: Host 'awk' tool is outdated. Please define

• HOST-Awk to Point to Gawk or Nawk !

• Resolution:

• Goto the android-ndk/prebuilt/windows/bin/

• Change the awk.exe to awk_.exe

• Now you may see the following output after successful execution

• After successful creating libSampleNDK.so file, refresh your Eclipse project

• You can see the updated "Project Explorer" with "libs" folder in the tree hierarchy

• Update the java source code now by adding this library to it

Source code of SampleNDKActivity.java

package com.samplendk;

import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;

public class SampleNDKActivity extends Activity {
   
    static
    {
        System.loadLibrary("SampleNDK");
    }
   
    //Declare the native method
    private native String invokeNativeFunction();
   
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        //Call the native methods
        String hello = invokeNativeFunction();
        new AlertDialog.Builder(this).setMessage(hello).show();
    }
   
}

• Clean the project by Selecting "Project"->"Clean"

• Run the application as "Android Application"

• Note:

• Error:

• java.lang.unsatisfiedLinkError Library -- not found

• Resolution:

• Please see if you have added the "lib" in java source before adding the library in System.loadLibrary() method
• Please find the screenshot of above running program in emulator

If you have queries, please mail to psrdotcom@gmail.com

Customize Command Prompt in Windows 7 with your own Icon, Starting Directory and more settings ...

Hi all,

Are you getting bored with the same command prompt with black colored background and other settings?

You can customize your own command prompt and you can start from the preferred location (Directory) path, choose your own icon and lot more.

Go ahead by following the below steps ..


Creating the shortcut icon on Destop

1. Right click on the desktop, select "New" -> "shortcut"
2. Browse for the command prompt executable file "cmd.exe"
3. If you have installed your Operating System in C drive then the path might be similar to this
4. C:\Windows\System32\cmd.exe
5. Click on "Next"
6. Type the name for this shortcut, something like "MyCmdPrompt"
7. Click on "Finish"
8. Now you can see your command prompt named of your own choice
9. Now, you can change some properties of your command prompt

Changing the properties of the custom command prompt

• Right click on the newly created shortcut from the Desktop

• Select "Shortcut" tab and change the following settings

1. Change the starting directory: Specify your own choice of directory path in the "Start in" box.
2. Default Start in path: C:\Windows\System32
3. Change the icon of your own choice: Click on "Change Icon" and Click on "Browse" button and Select the "C:\Windows\System32\imageres.dll" to list all the windows installed icons.
4. Select an icon of your own choice and Click on "Ok"
5. Run as Administrator by default: Click "Advanced" button, Select "Run as administrator" and Click "Ok"

• Select "Options" tab and change the following settings

1. Check "Quick Edit mode" to copy and paste easily

• Select "Font" tab and change the following settings

1. select your desired "Font" and "Size" settings

• Select "Layout" tab and change the following settings

1. select your desired "Window Size"
2. Note: To see a bigger screen, increase the "Width and Height" attributes of the "Window Size"
3. You can preview, your settings in the left side preview

• Select "Colors" tab, You might be bored by seeing the same black and white combination.

1. Choose your desired colors for Background, Foreground colors for both the "Screen" and "Pop-Up screen"

• Click on "Apply" and then "Ok" to see your own command prompt.

Hope this post is useful to you customize your own Command Prompt in Windows 7.

For further queries, mail to psrdotcom@gmail.com